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Real Estate and Intangible Assets - Summary of Total Revenue and Earnings Recognized on Properties Acquired (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Real Estate Properties [Line Items] |  |
Rental revenue | $ 2,622,327 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | $ 1,495,636 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
2015 New Real Estate Activity [Member] |  |
Real Estate Properties [Line Items] |  |
Rental revenue | 200,432 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |
Earnings | 104,237 land_RealEstatePropertiesEarningsRecognized / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |
2015 New Real Estate Activity [Member] | Espinosa Road [Member] |  |
Real Estate Properties [Line Items] |  |
Acquisition Date | Jan. 05, 2015 |
Rental revenue | 186,216 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RealEstatePropertiesAxis = land_EspinosaRoadMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |
Earnings | 97,058 land_RealEstatePropertiesEarningsRecognized / us-gaap_RealEstatePropertiesAxis = land_EspinosaRoadMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |
2015 New Real Estate Activity [Member] | Parrish Road [Member] |  |
Real Estate Properties [Line Items] |  |
Acquisition Date | Mar. 10, 2015 |
Rental revenue | 14,216 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RealEstatePropertiesAxis = land_ParrishRoadMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |
Earnings | $ 7,179 land_RealEstatePropertiesEarningsRecognized / us-gaap_RealEstatePropertiesAxis = land_ParrishRoadMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = land_TwoThousandFifteenNewRealEstateActivityMember |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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- Details
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- Details
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